[Thread] ignore the flaky test case advertisingProxy_srpClientUnregistersService_serviceIsNotDiscoverableByMdns

The flakiness of this test case is 1%. Disable the test case to prevent
the whole test module from being demotioned.

Bug: 333078476
Bug: 333806992
Change-Id: I820f7a567a7827eee280d0f545c9f654efe5eeaa
diff --git a/thread/tests/integration/src/android/net/thread/ServiceDiscoveryTest.java b/thread/tests/integration/src/android/net/thread/ServiceDiscoveryTest.java
index 5a8d21f..e10f134 100644
--- a/thread/tests/integration/src/android/net/thread/ServiceDiscoveryTest.java
+++ b/thread/tests/integration/src/android/net/thread/ServiceDiscoveryTest.java
@@ -265,6 +265,7 @@
     }
 
     @Test
+    @Ignore("TODO: b/333806992 - Enable when it's not flaky at all")
     public void advertisingProxy_srpClientUnregistersService_serviceIsNotDiscoverableByMdns()
             throws Exception {
         /*